分汊河道分流区航道内斜流的整治方法研究

 沅水桃源大桥位于分汊河段分流区，桥位区航道内水流与大桥斜交，桥墩出水后海事不断。为探讨该处碍航斜流流态的整治方法，进行了比尺模型试验，对斜流的特性和整治措施进行了研究，提出了分流点相对上移的整治思路，构思了非对称非等高鱼嘴，并用上述方法进行了试验研究。结果表明，该方法整治分汊河道分流段桥位区碍航斜流险滩的效果比其他几种常规方法更好。工程实施后的原型观测表明，整治工程的效果是明显的。

Investigation on regulation method of oblique flow in bifurcation region of braided reach

The Yuansbui River's Taoyuan Bridge was located in the bifurcation region of braided reach. Anoblique intersection of flow direction in navigation region and bridge axial line occured and caused a lot of mar-itime affairs after the bridge piers being completed. For exploring the regulation method to solve the flow-patternof obstructing navigation, the hydraulic model test, induding studying oblique flow characteristics and regulationmeasures,was performed, and, at last, a new regulation scheme in which the shoal-head expanded toward up-stream and its configuration took an unsymmetrical fish-lips form with unequal altitude was proPOsed. The testresults showed that the effect of this scheme is better than other conventional regulation methods. After the pro-ject being completed, the prototype observed data indicated that the effect of the regulation project is obvious.